Why the than is going to be executed in Macbeth?

The "Thane of Cawdor" is executed in Shakespeare's Macbeth because he is found guilty of treason and betrayal, having betrayed King Duncan by aligning with the Norwegian invaders. His execution serves as a warning to others who may attempt to deceive or betray the king. The title of Thane of Cawdor is then awarded to Macbeth for his valor and loyalty in battle.